diff -up chromium-100.0.4896.75/ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.cc.old-xkb chromium-100.0.4896.75/ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.cc
--- chromium-100.0.4896.75/ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.cc.old-xkb	2022-04-08 10:12:14.725197002 -0400
+++ chromium-100.0.4896.75/ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.cc	2022-04-08 10:13:04.512511489 -0400
@@ -31,14 +31,6 @@
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 #include "ui/events/keycodes/keyboard_code_conversion_xkb.h"
 
-// xkb_keymap_key_get_mods_for_level is relatively new (introduced in ver 1.0,
-// Sep 6, 2020), thus it is not available on some platform, such as Ubuntu
-// 18.04, which we still supports.
-// Thus declare the function as weak here, so we can check the availability on
-// runtime.
-extern "C" __attribute__((weak)) decltype(
-    xkb_keymap_key_get_mods_for_level) xkb_keymap_key_get_mods_for_level;
-
 namespace ui {
 
 namespace {
@@ -925,18 +917,10 @@ void XkbKeyboardLayoutEngine::SetKeymap(
         const xkb_keysym_t* keysyms;
         int num_syms = xkb_keymap_key_get_syms_by_level(keymap, keycode, layout,
                                                         level, &keysyms);
-        if (xkb_keymap_key_get_mods_for_level) {
-          xkb_mod_mask_t masks[100];  // Large enough buffer.
-          int num_mods = xkb_keymap_key_get_mods_for_level(
-              keymap, keycode, layout, level, masks, std::size(masks));
-          AddEntries(base::make_span(keysyms, num_syms),
-                     base::make_span(masks, num_mods), keycode);
-        } else {
           // If not, unfortunately, there's no convenient/efficient way
           // to take the possible masks. Thus, use mask 0 always.
           constexpr xkb_mod_mask_t kMask[] = {0};
           AddEntries(base::make_span(keysyms, num_syms), kMask, keycode);
-        }
       }
     }
   }
@@ -1000,10 +984,7 @@ int XkbKeyboardLayoutEngine::UpdateModif
 
 DomCode XkbKeyboardLayoutEngine::GetDomCodeByKeysym(uint32_t keysym,
                                                     uint32_t modifiers) const {
-  // If xkb_keymap_key_get_mods_for_level is not available, all entries are
-  // stored with modifiers mask is 0.
-  if (!xkb_keymap_key_get_mods_for_level)
-    modifiers = 0;
+  modifiers = 0;
 
   auto iter = xkb_keysym_map_.find(XkbKeysymMapKey(keysym, modifiers));
   if (iter == xkb_keysym_map_.end()) {